DNR urges homeowners to resist pruning or removing conifers with red needles until late spring

Conifers growing in Minnesota have had a long, hard winter with plenty of opportunities for winter injury, according to the Department of Natural Resources (DNR).

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The Sleepy Eye Herald Dispatch

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Posted Apr. 18, 2013 at 2:55 PM
Updated Apr 18, 2013 at 2:57 PM

Posted Apr. 18, 2013 at 2:55 PM
Updated Apr 18, 2013 at 2:57 PM

Sleepy Eye, Minn.

Conifers growing in Minnesota have had a long, hard winter with plenty of opportunities for winter injury, according to the Department of Natural Resources (DNR). By now, many people have noticed conifers full of brown and red needles, especially along highways. People might have seen the conifers in their yards, or along buildings and driveways, are turning red or brown.

In spite of their appearance, people should not prune or remove the discolored trees. Chances are good that the trees are alive and healthy beneath their mask of red needles. Buds were well protected during the winter and will grow once spring arrives, said Jana Albers, DNR forest health specialist.

The most evident damage, caused by de-icing salts, occurred on white pines growing along highways. This salty water settles on the pines and is absorbed into individual needles, killing them back starting at the tips. Other damage to conifers can be caused by winter drying, or needle dehydration.

”Throughout the winter, each passing car sends up clouds of salty water,” Albers said. “Winter injury is also caused by strong, dry winds, many days of bright sunshine.” and low relative humidity that dries the needles

Some trees or groups of trees seem to get winter injury every year. It is likely the trees are stressed due to poor site conditions.

Native tree populations are adapted to their location. Moving seeds or seedlings 100 miles north or south of their site of origin can result in damage due to winter injury.

Prevention techniques:

* When selecting trees to plant, choose species that are adapted to local growing conditions.